package com.example.myapplication;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ActivityInfo;
import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.example.myapplication.view.CourseView;
import com.example.myapplication.view.ExercisesView;
import com.example.myapplication.view.MyInfoView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private FrameLayout mBodyLayout;//中间内容栏
    private LinearLayout mBottomLayout;//底部按钮栏
    //底部按钮：
    private View mCourseBtn;
    private View mExerxisesBtn;
    private View mMyInfoBtn;
    private TextView tv_course;
    private TextView tv_exercises;
    private TextView tv_myinfo;
    private ImageView iv_course;
    private ImageView iv_exercises;
    private ImageView iv_myinfo;
    private TextView tv_back;
    private TextView tv_main_title;
    private RelativeLayout rl_title_bar;
    private MyInfoView mMyInfoView;
    private ExercisesView mExercisesView;
    private CourseView mCourseView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        init();
        initBottomBar();
        setListener();
        setInitStatus();
    }

    private void init() //获取界面上的ui控件
    {
        tv_back=findViewById(R.id.tv_back);
        tv_main_title=findViewById(R.id.tv_main_title);
        tv_main_title.setText("博学谷课程");
        rl_title_bar=findViewById(R.id.title_bar);
        rl_title_bar.setBackgroundColor(Color.parseColor("#30B4FF"));
        tv_back.setVisibility(View.GONE);
        initBodyLayout();
    }
    private void initBodyLayout()//获取中间布局
    {
        mBodyLayout=findViewById(R.id.main_body);
    }
    private void initBottomBar()//获取底部导航栏上的控件
    {
        mBottomLayout=findViewById(R.id.main_bottom_bar);
        mCourseBtn=findViewById(R.id.bottom_bar_course_btn);
        mExerxisesBtn=findViewById(R.id.bottom_bar_exercises_btn);
        mMyInfoBtn=findViewById(R.id.bottom_bar_myinfo_btn);
        tv_course=findViewById(R.id.bottom_bar_text_course);
        tv_exercises=findViewById(R.id.bottom_bar_text_exercises);
        tv_myinfo=findViewById(R.id.bottom_bar_text_myinfo);
        iv_course=findViewById(R.id.bottom_bar_image_course);
        iv_exercises=findViewById(R.id.bottom_bar_image_exercises);
        iv_myinfo=findViewById(R.id.bottom_bar_image_myinfo);
    }
    @Override
    public void onClick(View v) //控件的点击事件
    {
        switch (v.getId()){
            case R.id.bottom_bar_course_btn://课程的点击事件
                clearBottomImageState();
                selectDisplayView(0);
                break;
            case R.id.bottom_bar_exercises_btn://习题的点击事件
                clearBottomImageState();
                selectDisplayView(1);
                break;
            case R.id.bottom_bar_myinfo_btn://我的的点击事件
                clearBottomImageState();
                selectDisplayView(2);
                break;
            default:break;
        }
    }
    private void clearBottomImageState()//清除底部按钮的选中状态
    {
        tv_course.setTextColor(Color.parseColor("#666666"));
        tv_exercises.setTextColor(Color.parseColor("#666666"));
        tv_myinfo.setTextColor(Color.parseColor("#666666"));
        iv_course.setImageResource(R.drawable.main_course_icon);//setImageResource设置图片资源为，设为原图
        iv_exercises.setImageResource(R.drawable.main_exercises_icon);
        iv_myinfo.setImageResource(R.drawable.main_my_icon);
        for(int i=0;i<mBottomLayout.getChildCount();i++){//遍历子节点，设置每一个子节点的选中状态为false
            mBottomLayout.getChildAt(i).setSelected(false);
        }
    }
    private void selectDisplayView(int index)//选择显示的视图
    {
        removeALLView();
        createView(index);
        setSelectedStatus(index);
    }
    private void removeALLView()//移除不需要的视图
    {
        for (int i=0;i<mBodyLayout.getChildCount();i++){
            mBodyLayout.getChildAt(i).setVisibility(View.GONE);//View.GONE  不可见，并且不留痕迹，不占位置
        }
    }
    private void createView(int viewIndex)//选择视图
    {
        switch (viewIndex){
            case 0://课程界面
                if (mCourseView == null) {
                    mCourseView = new CourseView(this);
                    mBodyLayout.addView(mCourseView.getView());
                } else {
                    mCourseView.getView();
                }
                mCourseView.showView();
                break;
            case 1://习题界面
                if(mExercisesView==null){
                    mExercisesView=new ExercisesView(this);
                    mBodyLayout.addView(mExercisesView.getView());
                }else {
                    mExercisesView.getView();
                }
                mExercisesView.showView();
                break;
            case 2://我的界面
                if(mMyInfoView==null){
                    mMyInfoView=new MyInfoView(this);
                    mBodyLayout.addView(mMyInfoView.getView());
                }else {
                    mMyInfoView.getView();
                }
                mMyInfoView.showView();
                break;
        }
    }
    private void setSelectedStatus(int index) {//设置底部按钮选择选中状态
        switch (index){
            case 0:
                mCourseBtn.setSelected(true);
                iv_course.setImageResource(R.drawable.main_course_icon_selected);
                tv_course.setTextColor(Color.parseColor("#0097F7"));
                rl_title_bar.setVisibility(View.VISIBLE);
                tv_main_title.setText("博学谷课程");
                break;
            case 1:
                mExerxisesBtn.setSelected(true);
                iv_exercises.setImageResource(R.drawable.main_exercises_icon_selected);
                tv_exercises.setTextColor(Color.parseColor("#0097F7"));
                rl_title_bar.setVisibility(View.VISIBLE);
                tv_main_title.setText("博学谷习题");
                break;
            case 2:
                mMyInfoBtn.setSelected(true);
                iv_myinfo.setImageResource(R.drawable.main_my_icon_selected);
                tv_myinfo.setTextColor(Color.parseColor("#0097F7"));
                rl_title_bar.setVisibility(View.GONE);
                break;
        }
    }
    private void setListener()//设置三个按钮的监听事件
    {
        for (int i=0;i<mBottomLayout.getChildCount();i++){
            mBottomLayout.getChildAt(i).setOnClickListener(this);
        }
    }
    private void setInitStatus() //设置界面view初始状态
    {
        clearBottomImageState();
        setSelectedStatus(0);
        createView(0);
    }
    protected long exitTime;//记录第一次点击的时间
    @Override
    public boolean onKeyDown(int KeyCode, KeyEvent event){
        if(KeyCode==KeyEvent.KEYCODE_BACK&&event.getAction()==KeyEvent.ACTION_DOWN){
            if(System.currentTimeMillis()-exitTime>2000){
                Toast.makeText(MainActivity.this,"再按一次退出博学谷",Toast.LENGTH_SHORT).show();
                exitTime=System.currentTimeMillis();
            }else {
                MainActivity.this.finish();
                if (readLoginStatus()){
                    clearLoginStatus();
                }
                System.exit(0);//退出程序
            }
            return true;
        }
        return super.onKeyDown(KeyCode,event);
    }
    private boolean readLoginStatus() //获取SharedPreferences登录状态
    {
        SharedPreferences sp=getSharedPreferences("loginInfo", Context.MODE_PRIVATE);
        boolean isLogin=sp.getBoolean("isLogin",false);
        return isLogin;
    }
    private void clearLoginStatus()//清除SharedPreferences登录状态
    {
        SharedPreferences sp=getSharedPreferences("loginInfo", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor=sp.edit();//获取编辑器
        editor.putBoolean("isLogin",false);//清除登录状态
        editor.putString("loginUserName","");//清除登录时的用户名
        editor.commit();//提交修改
    }
    @Override//当用户成功登录时，“我”的界面重新设置
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (data!=null){//从设置界面或登录界面传递过来的登录状态
            boolean isLogin=data.getBooleanExtra("isLogin",false);
            if (isLogin){//登录成功时显示课程界面
                clearBottomImageState();
                selectDisplayView(0);
            }
            if (mMyInfoView!=null){
                mMyInfoView.setLoginParams(isLogin);
            }
        }
    }
}

